Comparison of project management software - Wikipedia^ a b Includes a very simple time tracking mechanism, enough to produce relevant data for invoicing as well as to compare it with the actual overall budget. ^ a b c d O'Dell, Jolie (13 January 2009). "Twitter for Teams: Teambox Launches Web-Based Collaboration Tool". ReadWriteWeb. Archived from the original on 2 May 2012. Retrieved 5 May 2012. ^ "Basecamp 2 Help". basecamp.com. Retrieved 16 June 2
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